CN103795145A - Distributed power supply node real-time monitoring and analyzing system device and analyzing method - Google Patents
Distributed power supply node real-time monitoring and analyzing system device and analyzing method Download PDFInfo
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Abstract
The invention relates to a distributed power supply node real-time monitoring and analyzing system device which mainly comprises a data real-time collecting and intelligent analyzing lower computer, an upper computer capable of checking current and history data, a wireless data transmission function module and the like. The lower computer comprises a sensor device for power supply node parameter collecting, a signal conditioning device for amplifying sensing signals and an embedded device for processing and analyzing data amplified by the signal conditioning device. A quick Fourier computing method with an attached Hamming window is improved, data length is adjusted in a self-adaptation mode, the contradiction between multi-channel data signal analyzing and processing speed of a traditional FFT algorithm is solved, on the basis that accuracy is guaranteed, hardware resource consumption is lowered, and signal processing efficiency is improved. The lower computer is easy and convenient to operate, a corresponding wireless communication network is combined, and integrated management on multi-power-supply-node-parameter monitoring of the upper computer is achieved.
Description
Technical field
The present invention has designed a kind of distributed power source node parameter Real-Time Monitoring and intelligent analysis method, particularly develops and realized distributed electrical source node real time monitoring and analyzing system and device and analytical method.
Background technology
Due to fossil energy particularly large-scale developing and utilizing of coal biological environment is caused and is had a strong impact on, various countries actively push forward clean energy resource generating.In China; to " 12. five " end; non-fossil energy consumption accounts for primary energy consumption proportion will reach 11.4%; non-fossil energy generator installation proportion reaches 30%; abundant and possess diversification and utilize the area of condition at Renewable Energy Resources, utilize and concentrate exploitation to combine with distributed power generation, promote clean energy resource diversification general layout and develop; to preserving the ecological environment, tackle climate change, guaranteeing national energy security, realize sustainable development and have great importance.Clean energy resource distributed power generation, with micro-electrical network form access low-voltage network, can make full use of energy resource structure diversity and convenience, to reduce the negative effect of electrical production to environment.
Micro-electrical network refers to by distributed power source, energy storage device, energy converter, relevant load and supervisory control system, protective device and collects the small-sized electric system of being transported to forming; be one and can realize the autonomous system that oneself controls, protects and manage; both can be incorporated into the power networks with external electrical network, also can independent operating.On the one hand, make full use of renewable energy power generation for China readjust the energy structure, protection of the environment, exploitation western part, solve rural area energy and outlying district electricity consumption, to carry out ecological construction etc. all significant; On the other hand, the development potentiality of Chinese regenerative resource is very huge.But in micro-electrical network, each distributed electrical source node formation differs greatly and has intermittence.Such as photovoltaic generation, wind power generation, tidal power generation etc. are subject to the impact of seasonal climate, large electrical network is frequently cut and exited to micro-electric network source, the stable of the possibility that fault occurs and system must be affected, and people are more and more higher to the stability requirement of supply of electric power, guarantee that the requirement of the quality of power supply is also more outstanding.Therefore, how each distributed power source node parameter in micro-electrical network is carried out to Real-Time Monitoring, and its operation conditions is carried out to intellectual analysis and assessment, for follow-up Optimized Operation and relaying protection decision-making provide information to have important Research Significance.
In order to adapt to the access of more and more large-scale clean energy resource power generation applications and distributed power source, facilitate administration of power networks staff to assess the access power consumption equipment of electrical network and the health status of each node power, various portable energy monitor analyzers produce thereupon, and development is also more and more ripe.Wherein, Fluke company is the leader of world's Electronic Testing tool production, distribution and service, and its high quality of products has obtained being widely used, and the Fluke 435 II three-phase electric energy analyzers of its production are a outstanding power quality analyzers.Fluke 435 II analyzers can be used alternatingly by single-phase three-phase, it is 1000V that maximum voltage is measured effective value (interchange+direct current), it is 6000A that maximum current is measured effective value (interchange+direct current), can measure effective value, frequency, phase place, power factor, power, also can the measuring voltage numerical value such as general, voltage swells, three-phase imbalance rate, voltage flicker temporarily.Measurement function is complete, precision is high, high safety.It carries the data that SD card is measured for saving scene, for staff's statistical analysis.This equipment also can be connected to PC, keeps real-time communication with PC, and real time data also can be saved on PC.It is also equipped with analysis software, facilitates staff to analyze data.Image conversion operation interface, the graphical display function of the multiple personals such as integrated oscilloscope, curve chart, form.And the CA8335 that French CA company produces can mass-synchrometer be also a outstanding power quality analyzer.Maximum slotted line voltage (interchange+direct current) 960V, maximum electric current (interchange+direct current) 6500A that measures; 4 road voltages and 4 road electric current inputs; Can catch simultaneously and record all electrical parameters, transient-wave and alarm; Join vast capacity 2GSD storage card, all electrical parameters of recording occurring continuously reach 1 month simultaneously; CA8335 menu comprises letter/Chinese-traditional containing 21 kinds of language, easy and simple to handle and accurate; Show in real time voltage current waveform; Harmonic wave to 50 can be surveyed, flickering calculating can be carried out; Backup and storage screenshotss (image and data); Tendency chart is output to PC, PC software support data recover to read, can be in real time and instrument keep in communication.Afterwards, on domestic market, also there is the product of many independent researches, as the HVB-Q hand-hold type electric energy mass-synchrometer of the portable three-phase electric energy mass-synchrometer of the magnificent safe DT3561 of state electricity, magnificent electric Gaosheng etc.These Realization of Products the portability of in-site measurement, simplify large, but the communication of the said goods and host computer is one to one substantially, cannot carry out to portable equipment data the operating platform of unified management, more each distributed electrical source node cannot be unified to monitor and complete the intellectual analysis of related data.
In sum, realize the comprehensive monitoring of distributed power source node parameter, not only need to take into full account simplification, the portability of monitoring terminal testing equipment, also need to consider real-time Transmission and the unified coordination and administration of distributed node data.But the function major part of prior art is integrated on portable set, the increase of interstitial content not only makes equipment investment increase, and there is no remote moving function, can not realize function conversion and the equipment operation management of on-line measurement.
The parameter of distributed power source node parameter real time monitoring and analyzing is more, multichannel FFT(fast Fourier transform) amount of calculation is larger, along with the raising of precision and the sample frequency of data, the data amount of calculation of equipment is how much multiples and rises.Traditional FFT algorithm cannot solve the contradiction between multichannel data signal analysis error and processing speed.In order to obtain high-precision real time data, need the hardware that use cost is higher to support.
Summary of the invention
Technical problem to be solved by this invention is to provide more efficiently method and system device for distributed power source node parameter real time monitoring and analyzing, in the situation that taking into full account construction cost and hardware spending, obtain fast the real-time monitor data more accurate, data volume is larger, solve the contradiction of traditional FFT algorithm between multichannel data signal analysis error and processing speed, improved the real-time of system and device monitoring.And realize the wireless communication networking of many power supply nodes parameter monitoring, greatly reduced the difficulty of bringing in wiring, be convenient to debug test, there is adaptability and autgmentability flexibly.
The present invention is achieved through the following technical solutions above-mentioned purpose: for the shortcoming of existing distributed power source node parameter detection, analytical system, design distributed electrical source node real time monitoring and analyzing system and device, this system and device comprises that one or more is above for collecting the slave computer of data and carrying out with slave computer that communication is connected and collection gathers the host computer of slave computer data.Described slave computer comprises the sensor device detecting in real time for power supply node is carried out, carry out amplifying signal conditioning device for the data-signal that sensor device is obtained, for to calculating and the digital signal processing device of intellectual analysis through conditioning amplifying signal, and for by the wireless data transmission device establishing a communications link between slave computer and host computer.
The sensor device of slave computer carries out data signal samples to one or more nodes of electrical network, obtains real-time grid nodes data-signal.The transducing signal obtaining by voltage, current transformer is comparatively faint, is not suitable for processing, so it is carried out to signal amplification by signal regulating device.Amplifying signal calculates in Digital Signal Processing and intellectual analysis device after A/D sampling, obtains synthetic waveform and the needed voltage of analysis, electric current, phase place, frequency, amplitude and phase data, and by testing result by wireless network transmissions to host computer.Amplitude, phase place and the harmonic component of each power supply node all obtains by the fast fourier transform of additional Hamming window is improved to algorithm, and described Hamming window function is
Wherein,
for sampling number,
the of representative sampling
individual point; To sample sequence
carry out obtaining after windowing process
Right
carrying out FFT obtains
The FFT interpolation formula that Hamming window is corresponding is
In formula
, and
,
with
amplitude and the phase place of corresponding each harmonic respectively.The present invention is by participating in the data volume of FFT to gathering points N and the comprehensive assessment of sampling way, self adaptation is adjusted data length, solve the contradiction between traditional FFT algorithm multichannel data Digital Signal Analysis and Processing speed, on the basis of guaranteeing precision, reduce hardware resource expense, improve the efficiency of signal processing.
Described sensor device comprise one or more for connect and the forcipated mutual-inductor of Real-Time Monitoring power supply node electric current and voltage size, for collecting the interconnecting module of forcipated mutual-inductor output signal.Described forcipated mutual-inductor is connected with interconnecting module respectively, and can on power supply node, fast install, and adopt the instrument and meter interface mode of standard to be connected with interconnecting module, flexible and convenient operation, autgmentability is stronger.
Described signal regulating device comprises signal Isolation Amplifier Module, reverse summation module and reverse amplification module; Described signal regulating device is followed the amplification of following of module settling signal by signal.In safe range ability, the output signal of sensor device is faint, if directly the output signal of voltage-current sensor is passed to the A/D sample port of microprocessor, can cause the problems such as measure error is large, the sensitivity indistinguishable of sensor device.Therefore, must be nursed one's health amplification to the output signal of voltage and current measurement transducer, in certain range ability, be improved certainty of measurement and without adopting more high accuracy and more highly sensitive expensive sensor device.
Described Digital Signal Processing and intellectual analysis device comprise A/D modular converter, voltage and current computing module, phase place, frequency calculation module and waveform synthesis module etc.A/D modular converter converts the analog signal of obtaining from signal regulating device to digital signal, and be transferred to respectively voltage and current computing module, phase place, frequency calculation module and amplitude, phase calculation module and carry out data processing and obtain voltage, electric current, phase place, frequency, amplitude and phase data etc., and being transferred to waveform synthesis module, to carry out waveform synthetic.
Described transmitting device is radio transmitting device.Radio transmitting device adopts the Zigbee wireless zone networking based on IEEE 802.15.4 standard, has stronger stability and the flexibility of expansion.
Slave computer also includes the input unit and the output device that connect with intellectual analysis device with Digital Signal Processing.Operating personnel can check operating state and the operation slave computer of micro-grid nodes on slave computer, and micro-electrical network is adjusted and safeguarded.Described input unit can be the input equipment such as keyboard, touch screen, and described output device can be the output equipment such as display, printer.
Described host computer comprises the communication module of the data that the transmitting device for accepting slave computer transmits and for storing, process the server module of the data that communication module obtains.
Distributed electrical source node real time monitoring and analyzing method used in the present invention comprises the following steps:
S010: set monitoring power supply node number and sample frequency;
S020: continuously one or more power supply nodes are carried out to data sampling according to sample frequency, obtain corresponding transducing signal;
S030: transducing signal is nursed one's health to amplification, obtain and can be used for the sample digital signal of laggard row data operation of A/D;
S040: the digital signal after A/D conversion is carried out respectively to data processing and obtain the parameters such as node voltage, electric current, amplitude, phase place, frequency power factor, three-phase imbalance rate, voltage flicker and harmonic component;
The method that described step S030 signal condition amplifies is that faint transducing signal isolate successively to amplifications, oppositely sued for peace, oppositely amplifies the data amplifying signal that acquisition after computing can be used for data operation.
Phase place, the frequency etc. of in described step S040, data amplifying signal being carried out to data processing acquisition node current is to improve algorithm by the fast fourier transform of additional Hamming window to obtain.
Described Hamming window function is
Wherein,
for sampling number,
the of representative sampling
individual point; To sample sequence
carry out obtaining after windowing process
Right
carrying out FFT obtains
The FFT interpolation formula that Hamming window is corresponding is
In formula
, and
,
with
amplitude and the phase place of corresponding each harmonic respectively.The present invention is by counting to gathering
data volume with sampling way comprehensive assessment participation FFT, self adaptation is adjusted data length, solve the contradiction between traditional FFT algorithm multichannel data Digital Signal Analysis and Processing speed, on the basis of guaranteeing precision, reduce hardware resource expense, improve the efficiency of signal processing.
The method that distributed electrical source node of the present invention detects in real time, analyzes also comprises step S050: amplitude, phase place, voltage, electric current, phase place and the frequency of step S040 data processing acquisition node current are carried out to waveform and synthesize.
The present invention has the following advantages: according to the comprehensive monitoring needs of existing micro-electrical network distributed power source node parameter, realize simplification, the portability of slave computer, real-time Transmission and the management of host computer to distributed node data simultaneously.Needed detection function major part is integrated on portable set, and in the situation that not needing significantly lifting means investment, the parameter that solves distributed power source node parameter real time monitoring and analyzing is more, FFT(fast Fourier transform) amount of calculation is large.Solve traditional FFT algorithm and cannot solve the contradiction between multichannel data signal analysis error and processing speed, obtain high-precision real time data.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention one;
Fig. 2 is the structural representation of the embodiment of the present invention one slave computer;
Fig. 3 is the sensor device modular structure schematic diagram of the embodiment of the present invention one slave computer;
Fig. 4 is the signal regulating device modular structure schematic diagram of the embodiment of the present invention one slave computer;
Fig. 5 is the Digital Signal Processing of the embodiment of the present invention one slave computer and the modular structure schematic diagram of intellectual analysis device;
Fig. 6 is the structural representation of the embodiment of the present invention one host computer;
Fig. 7 is the method step flow chart that the embodiment of the present invention one distributed electrical source node detects in real time, analyzes.
Embodiment
Embodiment mono-: as shown in Figure 1, the embodiment of the present invention comprises that many are carried out communication and collect the host computer that gathers slave computer data with slave computer for collecting the slave computer of data and one.Described slave computer comprise for power supply node is carried out the sensor device of data acquisition, for the data-signal that sensor device is obtained carry out amplifying signal conditioning device, for to through signal regulating device amplify data-signal carry out data processing Digital Signal Processing with intellectual analysis device with for setting up the transmitting device that data communication is connected between slave computer and host computer.
As shown in Figure 1, 2, by the sensor device of slave computer, one or more nodes of distributed power source are carried out to signal monitoring, obtain real-time power supply node data-signal.The transducing signal obtaining by sensor device is generally comparatively faint, is not suitable for carrying out A/D conversion, so each node transducing signal is carried out to signal condition amplification through signal regulating device.Amplifying signal, after A/D sampling, calculates in Digital Signal Processing and intellectual analysis device, obtains the parameters such as needed voltage, electric current, amplitude, phase place, frequency power factor, three-phase imbalance rate, voltage flicker and harmonic component.Slave computer uploads to host computer by data by wireless-transmission network.Communication modes between slave computer and host computer can be by cordless communication network or wireline communication network.Described Digital Signal Processing and intelligent analysis method at least comprise the fast fourier transform of additional Hamming window and improve algorithm realization.
As shown in Figure 2,3, described sensor device includes one or more for connecting power supply node and collecting the forcipated mutual-inductor of power supply node data and transmit the power supply node data of forcipated mutual-inductor collection and the instrument transformer transport module to signal regulating device by power supply node transfer of data for collecting.Described forcipated mutual-inductor connects with instrument transformer transport module respectively, can be on slave computer fast, install easily.
As shown in Figure 2,4, described signal regulating device comprises successively the signal Isolation Amplifier Module that connects, oppositely asks module and reverse amplification module.In safe range ability, the output signal of sensor device is faint, if directly the output signal of voltage and current measurement transducer is passed to microprocessor port, can cause the problems such as measure error is large, sensor device sensitivity is low.Therefore, must be nursed one's health amplification to the output signal of voltage, current sensor, in certain measuring range, be improved the sensitivity of certainty of measurement and sensor device, be guaranteed that this equipment is without adopting the more sensor device of high accuracy, sensitivity and Costco Wholesale.
As shown in Fig. 2,5, described Digital Signal Processing and intellectual analysis device also comprise A/D modular converter, the operational analysis modules such as voltage and current computing module, phase place, frequency.Described A/D modular converter converts the analog signal of obtaining from signal regulating device to digital signal, and is transferred to respectively the operational analysis modules such as voltage and current computing module, phase place, frequency, and being transferred to waveform synthesis module, to carry out waveform synthetic.
As shown in Figure 2,6, described transmitting device is radio transmitting device.Between host computer and slave computer, connect by cordless communication network, can avoid connecting up in installation process, and can be rapidly host computer be carried out to data with the slave computer in one or more nodes monitorings and connect.
As shown in Figure 2, slave computer also comprises the input unit and the output device that connect with intellectual analysis device with Digital Signal Processing.Site operation personnel can check operating state and the operation slave computer of power supply node on slave computer, and this monitoring device is adjusted and safeguarded.
As shown in Figure 2,6, described host computer comprises the communication module of the data that the transmitting device for accepting slave computer transmits and for storing, process the server module of the data that communication module obtains, and the managerial staff member of remote terminal can be by the inquiry of the communication setting of upper computer software interface completion system monitoring, historical and real time data.
Distributed power source node parameter real time monitoring and analyzing method used in the present invention comprises the following steps:
S010: set monitoring power supply node number and sample frequency;
S020: continuously one or more power supply nodes are carried out to data sampling according to sample frequency, obtain corresponding transducing signal;
S030: transducing signal is nursed one's health to amplification, obtain and can be used for the sample digital signal of laggard row data operation of A/D;
S040: the digital signal after A/D conversion is carried out respectively to data processing and obtain the parameters such as node voltage, electric current, amplitude, phase place, frequency power factor, three-phase imbalance rate, voltage flicker and harmonic component.
In real time power supply node is carried out to Real-Time Monitoring and intelligent data analysis according to above-mentioned steps S020 to step S040 periodic duty, and export the transmission of monitoring result and data, the instruction until input quits work.
The method that described step S030 signal condition amplifies is that faint transducing signal isolate successively to amplifications, oppositely sued for peace, oppositely amplifies the data amplifying signal that acquisition after computing can be used for data operation.
Phase place, the frequency etc. of in described step S040, data amplifying signal being carried out to data processing acquisition node current is to improve algorithm by the fast fourier transform of additional Hamming window to obtain.
The method that distributed electrical source node of the present invention detects in real time, analyzes also comprises step S050: the amplitude, phase place and the frequency that step S040 data processing are obtained to node voltage, electric current are carried out the synthetic output of waveform.
Claims (10)
1. distributed electrical source node real time monitoring and analyzing method, is characterized in that described method comprises the following steps:
S010: the power supply node number that can set sample frequency, monitoring;
S020: serially the electrical quantity of one or more power supply nodes is monitored by voltage, current sensor, obtain faint transducing signal;
S030: faint transducing signal is isolated and amplified conditioning, form and be applicable to the directly amplifying signal of input of digital signal processor A/D sampling end;
S040: the digital signal that amplifying signal is carried out after A/D sample conversion is processed and analyzed, and then obtaining the real-time condition of each power supply node parameter, described real-time condition at least comprises voltage, electric current, amplitude, phase place, frequency power factor, three-phase imbalance rate, voltage flicker and harmonic component; Amplitude, phase place and the harmonic component of each power supply node all obtains by the fast fourier transform of additional Hamming window is improved to algorithm, and described Hamming window function is
Wherein,
for sampling number,
the of representative sampling
individual point; To sample sequence
carry out obtaining after windowing process
Right
carrying out FFT obtains
(3)
The FFT interpolation formula that Hamming window is corresponding is
In formula
, and
,
with
amplitude and the phase place of corresponding each harmonic respectively.
2. distributed electrical source node real time monitoring and analyzing method according to claim 1, is characterized in that method that described step S030 signal amplifies is that faint data-signal is carried out successively to signal isolation is amplified, oppositely sum voltages lifting, oppositely obtains the signal applicable to the input of microprocessor A/D sampling end after amplifying conditioning computing.
3. distributed electrical source node real time monitoring and analyzing method according to claim 1, is characterized in that, in described step S040, data amplifying signal is carried out to data processing and can obtain in real time size, the voltage flicker of the electric current and voltage of each power supply node; In described step S040, data amplifying signal is carried out to intelligent computation analysis and obtains phase place, frequency and each harmonic component of each node current.
4. according to the analytical method described in claim 1 or 3 or 4, characterized by further comprising step S050: amplitude, phase place, the frequency of step S040 data processing acquisition node voltage or electric current are carried out to waveform and synthesize.
5. a distributed electrical source node real time monitoring and analyzing system and device, comprise that one or one are above for collecting the slave computer of data and carrying out with slave computer that communication is connected and collection gathers the host computer of slave computer data, it is characterized in that described slave computer comprise sensor device for power supply node being carried out to data acquisition,
For data-signal that sensor device is obtained carry out amplifying signal conditioning device,
For the data-signal amplifying through signal regulating device being carried out to Digital Signal Processing and the intellectual analysis device of data processing
With for setting up the transmitting device that data communication is connected between slave computer and host computer;
Described Digital Signal Processing and intellectual analysis device at least include amplitude, the phase calculation module of the harmonic wave fast Flourier calculating that adds Hanning window;
The window function of described Hanning window is:
Wherein,
for sampling number,
the of representative sampling
individual point;
To sample sequence
carry out obtaining after windowing process
:
The FFT interpolation formula that Hannning window is corresponding:
In formula
,
,
with
amplitude and the phase place of corresponding each harmonic respectively.
6. distributed electrical source node real time monitoring and analyzing system and device according to claim 5, is characterized in that described sensor device includes one or more for collecting the forcipated mutual-inductor of power supply node data, for collecting the instrument transformer transport module of transmission forcipated mutual-inductor data; Described forcipated mutual-inductor connects with instrument transformer transport module respectively.
7. distributed electrical source node real time monitoring and analyzing system and device according to claim 5, is characterized in that described signal regulating device comprises the signal Isolation Amplifier Module connecting successively, reverse summation module and reverse amplification module; Described signal regulating device completes the conditioning of the power supply node data that sensor device monitors.
8. distributed electrical source node real time monitoring and analyzing system and device according to claim 5, it is characterized in that described Digital Signal Processing and intellectual analysis device comprise A/D modular converter, voltage and current computing module, phase place, frequency calculation module and waveform synthesis module, described A/D modular converter converts the analog signal of obtaining from signal regulating device to digital signal, and be transferred to respectively voltage and current computing module, phase place, frequency calculation module and amplitude, phase calculation module is carried out data processing and is obtained voltage, electric current, phase place, frequency, amplitude and phase data, and being transferred to waveform synthesis module, to carry out waveform synthetic.
9. distributed electrical source node real time monitoring and analyzing system and device according to claim 5, is characterized in that described transmitting device is radio transmitting device; Described epigynous computer section comprises the communication module of the data that transmitting device transmits for accepting slave computer and for storing, analyze the office terminal of data.
10. according to the distributed electrical source node real time monitoring and analyzing system and device described in claim 5 or 6 or 7 or 8 or 9, characterized by further comprising the small keyboard input device and the LCDs output device that connect with intellectual analysis device with Digital Signal Processing.
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